[eradicate] ignore # language= in commented-out-code rule (ERA001)

Fixes one common case cited on #6019

crates/ruff_linter/src/rules/eradicate/detection.rs

@@ -16,7 +16,7 @@ static CODE_INDICATORS: LazyLock<AhoCorasick> = LazyLock::new(|| {
 
 static ALLOWLIST_REGEX: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(
-        r"^(?i)(?:pylint|pyright|noqa|nosec|region|endregion|type:\s*ignore|fmt:\s*(on|off)|isort:\s*(on|off|skip|skip_file|split|dont-add-imports(:\s*\[.*?])?)|mypy:|SPDX-License-Identifier:|(?:en)?coding[:=][ \t]*([-_.a-zA-Z0-9]+))",
+        r"^(?i)(?:pylint|pyright|noqa|nosec|region|endregion|type:\s*ignore|fmt:\s*(on|off)|isort:\s*(on|off|skip|skip_file|split|dont-add-imports(:\s*\[.*?])?)|mypy:|SPDX-License-Identifier:|language=[a-z](?: ?[-_.a-z0-9]+)+|(?:en)?coding[:=][ \t]*([-_.a-zA-Z0-9]+))",
     ).unwrap()
 });
 
@@ -297,6 +297,19 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn comment_contains_language_injection() {
+        assert!(comment_contains_code("# language=123", &[]));
+        assert!(comment_contains_code("# language=\"pt\"", &[]));
+        assert!(comment_contains_code("# language='en'", &[]));
+
+        assert!(!comment_contains_code("# language=xml", &[]));
+        assert!(!comment_contains_code(
+            "# language=ecma script level 4",
+            &[]
+        ));
+    }
+
     #[test]
     fn comment_contains_todo() {
         let task_tags = TASK_TAGS